Possible Clues:

• Glass or beer-mat needs changing
• Instrument for the front porch? Order one finally in deal
• Traffic circling capital dropping initial indicator
• One can tell what pressure we are under
• Indicator of impending change
• Weather gauge
• Bargain about nothing with me for the weather
• Forecaster's instrument
• Falling __ (picnicker's woe)
• That's the way to bargain round around me about the weather